Substituent effects on the reaction of 2-(substituted phenyl)-4,5-dihydro-4,4,5,5-tetramethylimidazol-1-oxyl 3-oxides with nitric oxide: an experimental and MNDO study
作者:Osamu Shimomura、Kazuhisa Abe、Minoru Hirota
DOI:10.1039/p29880000795
日期:——
constants of the oxygen transfer reaction of 2-(substituted phenyl)-4,5-dihydro-4,4,5,5-tetramethylimidazol-1-oxyl 3-oxides with nitric oxide have been measured by using liquid chromatography (h.p.l.c.). The Hammett ρ value (–0.37) indicates that electron-donating substituents favour the reaction. This can be explained by a mechanism which includes electron transfer to nitric oxide and can be rationalised by
使用液相色谱法测定了2-(取代的苯基)-4,5-二氢-4,4,5,5-四甲基咪唑-1-氧基3-氧化物与一氧化氮的氧转移反应的相对速率常数( hplc)。哈米特ρ值(–0.37)表明给电子取代基有利于反应。这可以通过包括电子转移到一氧化氮的机制来解释,并且可以通过半经验MNDO方法计算出的硝酰氧的前沿轨道能量和电子密度来合理化。